Diamond cutting pick and machining method thereof

Abstract

The invention belongs to the technical field of rock roadway tunneling, coal mining and engineering tunnel construction, and discloses a production method of a mushroom-shaped diamond tooth head cutting pick. The production method comprises the following steps that diamond micro-powder and a hard alloy substrate are compounded into a mushroom-shaped diamond composite tooth head under the conditions of high temperature and high pressure; and a low-melting-point high-strength silver-based solder is adopted to be melted on the bottom planes of diamond composite teeth, the solder is in a water drop shape after being solidified due to surface tension, and meanwhile the solder is placed in a cutting pick base body embedding hole preheated to a certain temperature to be welded into a whole. The method is characterized in that during welding, the top end of the water-drop-shaped solder makes contact with the hole bottom first to be molten, and hole bottom gas can be fully exhausted, so that itis guaranteed that a solder layer is free of slag inclusion, gas inclusion and insufficient solder faces, and the problem that insufficient soldering is formed due to the fact that during traditionalblind hole welding, gas at the hole bottom cannot be fully discharged is solved; and according to the soldering process, adverse effects caused by high-temperature soldering of the diamond compositeteeth are avoided, the soldering strength between the diamond composite teeth and a cutting pick body is effectively enhanced, and the diamond cutting pick produced through the process has higher impact resistance and abrasion resistance.

Description

technical field [0001] The invention relates to the technical field of coal mine tunnel excavation engineering construction, in particular to a diamond pick and a processing method thereof, a roadway boring machine, and a coal shearer. Background technique [0002] At present, roadheaders, fully mechanized mining machines, shield machines, and rotary drilling rigs are widely used in various coal mine tunneling engineering constructions in the closest prior art; cutting heads are roadheaders, fully mechanized mining machines, shield machines, rotary The main part of the drilling rig, the pick is fixed on the cutting head through the tooth seat. The pick usually adopts carbide tip (called carbide pick), mostly in the shape of a cone, and is directly fixed on the corresponding on the base. In the actual working process, the cutting head cuts the rock through the pick in the way of impact, and is the main stressed part. Wherein, when encountering the rock formation with higher...

AI Technical Summary

Problems solved by technology

[0004] In summary, the existing problems in the prior art are that the high temperature during traditional pick welding will affect the internal structure of the cemented carbide, reducing the strength, wear resistance, and impact resistance of the alloy teeth; reducing the use of picks life

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